Si and Cu are cooled to a temperature of 300K, then resisti…

Physics Current Electricity Resistance MCQ (Single Correct)

Si and Cu are cooled to a temperature of 300K, then resistivity:

For Si increases and for Cu decreases

For Cu increases and for Si decreases

Decreases for both Si and Cu

Increases for both Si and Cu

Text Solution

Verified by Experts

The correct answer is:

Resistivity of a metal is directly proportional to temperature and resistivity of semiconductor is inversely proportional to temperature.

Resistivity of metal ∝ Temperature

Resistivity for semiconductor ∝

This implies that with decreases in temperature resistivity of metal decreases while that of semiconductor increases.

Here, Si is a semiconductor and Cu is a metal. So, resistivity of Si increases but that of Cu decreases.

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